Robert Goyer covers the issue in his recent article in Flying Magazine. In the article, Goyer points out that the draft AC "strongly suggests that own-ship position (showing the little airplane on the moving map or chart) is an illegal function" and that the "FAA seems to be calling for individual approval of every portable device that goes in the cockpit, something that would cost individual operators thousands of dollars apiece".

FlightPrep agrees with AOPA, GAMA and Flying Magazine, and hopes that the FAA will revise the advisory circular and re-post it for public comment again. We'll keep following the issue and post any updates as they develop.